TigerBeetle

TigerBeetle is a financial transactions database designed for online transaction processing. Rather than storing general-purpose application data, it works directly in accounting terms, with built-in accounts and double-entry debit and credit transfers as first-class primitives. It is engineered for the safety and performance demands of money movement at scale.

It is built around a custom local storage engine and a global consensus protocol, and it runs as a replicated cluster that you operate yourself. You format and start replicas, then connect to the cluster, create accounts, and post transfers, including a built-in command-line REPL for direct interaction.

The quickest path is a single-replica cluster on Linux, with builds available for other platforms. TigerBeetle is written in Zig, with official client libraries in languages such as Java and others.